Constant Eco is 600 lumens and in common with competitors is brighter than the numbers might suggest but sensible enough for suburban stretches. While overkill for town, it’s not aggressive. 

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There’s enough navigational punch for semi-rural contexts, and no hassles with maintaining 20-23mph with ample warning of hedge clippings, holes etc. What really surprised me was how well it performed along unlit B-roads and at around 14-15mph. Hardly warp speed but certainly credible, should you need to conserve power on a longer ride, or if you’ve just been a bit slack where charging’s concerned.  

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Other traffic seemed to take notice (slowing and/or dipping their lights at 80 metres or so). No issues with being seen. Canal and towpaths are also passable with reasonable confidence, although run “stock” I’ve tended to unleash the full 1500 for anything particularly sheltered (if only for my own sense of security). 

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Through the suburbs, I could let rip 20-23mph, faster if traffic conditions permitted. Ample notice of glass, holes and signage. Plenty of presence at junctions, roundabouts and though things varied, I appeared to register on driver radars at 50 metres or so. 

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Arguably, the reactive flash is best for these contexts, since it will regulate its intensity. Sensors have come a long way in terms of their accuracy, and I’ve been captivated by how quickly, yet reliably it reads the environment. 

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Approaching road signs, it immediately became brighter before slowly tapering down. Whizz through an underpass, it would respond without hesitation, ditto if it registered car, or larger vehicle headlights. This was particularly welcome around town where traffic volumes and competing illuminations can make situations more challenging. 

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Indeed, I was surprised to discover (through the sticks with it playing backing singer to my dynamos) that it became brighter when it sensed a sudden movement- weaving around an obstacle, or accelerating hard on a climb, for example. Avoiding hazards often coincided with farm vehicles and HGV. The latter proved alert to my presence and crucially at a sensible distance-giving both parties' opportunity to regulate speed and course. 

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More frenetic around town but the effect was similar and bought me time at nastier roundabouts, dare I say more grace when entering the flow of traffic generally. Back along the deserted backroads and lonely lanes it would regulate output with similar and seemed to alternate between 600 and the full 1500 as conditions fluctuated. Though welcome across the board, this was a serious boon on foggy mornings. 

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As a daylight running mode, it has less punch than some master-blasters but plenty of presence and I found it effective, even in strong winter sun. 

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With my dynamos, the flashing seemed to remain at a consistent 600 lumens but would again increase when sensing a road sign, or other forms of lighting. 

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In any context, I am yet to have anyone say they were dazzled or distracted by it.